Sulfate-resistance Portland cement Introduction
一． In addition to physical performance of ordinary Portland cement, sulfate-resistance portland cement has good corrosion resistance, high strength, and general compatibility of cement and various additives, and easy construction and so on, so it can be widely used by the sulfate corrosion, erosion, freezing and wet and dry alternately harbor, water conservancy, electric power, underground, tunnels, culverts, water, roads, and bridges, foundation engineering, and high-rise buildings by the sulfate corrosion of foundation works.
二． The current national standard (GB748-2005) is divided into two cement grade:32.5 Sulfate-resistant cement, 42.5 Sulfate-resistant cement.Sulfate-resisitant cement category: moderate sulfate-resistant cement, high sulfate-resistant cement.
三． Technical performance
Sulfate-resistant cement technical performance
Standard Level |
Technical requirements |
C3S |
C3A |
LOSS |
MgO |
SO3 |
Insoluble residue |
Specific surface area |
Expansin rate of 14 antennas |
Na2O |
Setting time |
Flexural strength |
Compressive strength |
|||
Time of initial setting |
Time of final setting |
3d |
28d |
3d |
28d |
|||||||||||
32.5 |
GB |
≤55 |
≤5.0 |
≤3.0 |
≤5.0 |
≤2.5 |
≤1.5 |
＞280 |
≤0.060 |
≤0.6 |
≥45min |
≤10h |
≥2.5 |
≥6.0 |
≥10.0 |
≥32.5 |
The |
48.75 |
3.65 |
1.90 |
3.8 |
2.4 |
0.41 |
301 |
0.047 |
0.57 |
206 |
4:29 |
4.6 |
7.9 |
18.2 |
40.6 |
|
42.5 |
GB |
≤50 |
≤3.0 |
≤3.0 |
≤5.0 |
≤2.5 |
≤1.5 |
＞280 |
≤0.040 |
≤0.6 |
≥45min |
≤10h |
≥3.0 |
≥6.5 |
≥15.0 |
≥42.5 |
The |
44.30 |
2.70 |
1.10 |
3.00 |
1.80 |
0.37 |
378 |
0.035 |
0.55 |
204 |
04:45 |
5.0 |
7.7 |
27.6 |
47.2 |
|
